product_of_air_temperature_and_specific_humidity

complete
Created: Feb. 5, 2024
Proposer: Jonathan Gregory & Lars Barring
Proposed Date: 2024-01-10
#270
Change Date: Feb. 5, 2024, 3:43 p.m.
Term: product_of_air_temperature_and_specific_humidity
Unit: K
Unit ref: UPKA
AMIP:
GRIB:
The phrase "product_of_X_and_Y" means X*Y. "specific" means per unit mass. Air temperature is the bulk temperature of the air, not the surface (skin) temperature. Specific humidity is the mass fraction of water vapor in (moist) air.
Change Date: Feb. 5, 2024, 3:46 p.m.
Term: product_of_air_temperature_and_specific_humidity
Unit: K
Unit ref: UPKA
AMIP:
GRIB:
The phrase "product_of_X_and_Y" means X*Y. "specific" means per unit mass. Air temperature is the bulk temperature of the air, not the surface (skin) temperature. Specific humidity is the mass fraction of water vapor in (moist) air. It is strongly recommended to include a units_metadata attribute.
Change Date: Feb. 9, 2024, 3:10 p.m.
Term: product_of_air_temperature_and_specific_humidity
Unit: K
Unit ref: UPKA
AMIP:
GRIB:
The phrase "product_of_X_and_Y" means X*Y. "specific" means per unit mass. Air temperature is the bulk temperature of the air, not the surface (skin) temperature. Specific humidity is the mass fraction of water vapor in (moist) air. In order to convert the units correctly, it is essential to know whether a temperature is on-scale or a difference. Therefore this standard strongly recommends that any variable whose units involve a temperature unit should also have a units_metadata attribute to make the distinction. It is strongly recommended to include the attribute units_metadata.
Change Date: Feb. 23, 2024, 3:55 p.m.
Term: product_of_air_temperature_and_specific_humidity
Unit: K
Unit ref: UPKA
AMIP:
GRIB:
The phrase "product_of_X_and_Y" means X*Y. "specific" means per unit mass. Air temperature is the bulk temperature of the air, not the surface (skin) temperature. Specific humidity is the mass fraction of water vapor in (moist) air. It is strongly recommended that a variable with this standard name should have a units_metadata attribute, with one of the values "on-scale" or "difference", whichever is appropriate for the data, because it is essential to know whether the temperature is on-scale (meaning relative to the origin of the scale indicated by the units) or refers to temperature differences (implying that the origin of the temperature scale is irrevelant), in order to convert the units correctly (cf. https://cfconventions.org/cf-conventions/cf-conventions.html#temperature-units).